package com.josework.springhelloworld.entity.trade;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.*;
import java.util.stream.Collectors;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Transaction {
    private Trader trader;
    private int year;
    private int value;

    public String toString(){
        return "{" + this.trader + ", " +
                "year: "+this.year+", " +
                "value:" + this.value +"}";
    }

    public static void main(String[] args) {
        Trader raoul = new Trader("Raoul", "Cambridge");
        Trader mario = new Trader("Mario","Milan");
        Trader alan = new Trader("Alan","Cambridge");
        Trader brian = new Trader("Brian","Cambridge");
        List<Transaction> transactions = Arrays.asList(
                new Transaction(brian, 2011, 300),
                new Transaction(raoul, 2012, 1000),
                new Transaction(raoul, 2011, 400),
                new Transaction(mario, 2012, 710),
                new Transaction(mario, 2012, 700),
                new Transaction(alan, 2012, 950)
        );

        //找出2011年发生的所有交易，并按交易额排序
        List<Transaction> transactions1 = transactions.stream()
                .filter(t -> Objects.equals(t.getYear(), 2011))
                .sorted(Comparator.comparing(Transaction::getValue))
                .collect(Collectors.toList());
        // 交易员都在哪些不同的城市工作过？
        List<String> citys = transactions.stream()
                .map(Transaction::getTrader)
                .map(Trader::getCity)
                .distinct()
                .collect(Collectors.toList());

        List<String> citys2 = transactions.stream()
                .map(t -> t.getTrader().getCity())
                .distinct()
                .collect(Collectors.toList());

        //查找所有来自于剑桥的交易员，并按姓名排序。
        List<Trader> traders = transactions.stream()
                .map(Transaction::getTrader)
                .filter(t -> "Cambridge".equals(t.getName()))
                .sorted(Comparator.comparing(Trader::getName))
                .collect(Collectors.toList());

        // 返回所有交易员的姓名字符串，按字母顺序排序。
        String nameString = transactions.stream()
                .map(t -> t.getTrader().getName())
                .distinct()
                .sorted()
                .reduce("", (n1,n2) -> n1+n2);

        //有没有交易员是在米兰工作的？
        boolean b = transactions.stream()
                .map(Transaction::getTrader)
                .anyMatch(t -> "Milan".equals(t.getCity()));

        //打印生活在剑桥的交易员的所有交易额。
        Optional<Integer> allMoney = transactions.stream()
                .filter(t -> "Cambridge".equals(t.getTrader().getName()))
                .map(Transaction::getValue)
                .reduce(Integer::sum);

        //所有交易中，最高的交易额是多少？
        Optional<Integer> max = transactions.stream()
                .max(Comparator.comparing(Transaction::getValue))
                .map(Transaction::getValue);

        Optional<Integer> maxValue = transactions.stream()
                .map(Transaction::getValue)
                .reduce(Integer::max);

        //找到交易额最小的交易。
        Optional<Transaction> minTrans = transactions.stream()
                .min(Comparator.comparing(Transaction::getValue));




    }


}
